/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/Apache-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *
 */

package com.tencent.angel.graph.embedding.line

import com.tencent.angel.model.output.format.SnapshotFormat
import com.tencent.angel.model.{MatrixSaveContext, ModelSaveContext}
import com.tencent.angel.spark.context.PSContext

/**
  * Checkpoint tools
  */
object CheckpointUtils {
  /**
    * Write checkpoint for a batch of matrices
    *
    * @param checkpointId checkpoint id
    * @param names        matrices names
    */
  def checkpoint(checkpointId: Int, names: Array[String]): Unit = {
    val saveContext = new ModelSaveContext()
    names.foreach(matrix => {
      saveContext.addMatrix(new MatrixSaveContext(matrix, classOf[SnapshotFormat].getTypeName))
    })

    PSContext.instance().checkpoint(checkpointId, saveContext)
  }
}
